For the record it is great, they have done a very good job with proton and I am not diminishing that work.
But try to bring up this conversation on YouTube, reddit, or similar places and it becomes toxic very quickly. Even when presented with raw numbers. It has even gotten that way here a couple times.
And the Steam thing is a big sore point right now, for the average user once you leave Steam it is not as user friendly as just running Windows.
Valve's marketing also isn't helping the situation in the slightest.